Recliner 4-Bar Simulator

Fab Academy CNC Week · crank 70°–160°

CHAIR LINKAGE

✥ drag to pan · scroll to zoom

⚠ Set scale to 1.0× or Bake values first

Link Lengths (mm)

L1 Ground A→D 471→471

Set scale to 1.0× to edit

L2 Crank A→B (Backrest) 182→182

Set scale to 1.0× to edit

L3 Coupler B→C (Seat) 450→450

Set scale to 1.0× to edit

L4 Rocker C→D (Footrest) 205→205

Set scale to 1.0× to edit

Scale (keeps ratios)

Scale × 1.0×

All links × 1.0 — no change

Animation

MIN ° MAX °

Crank angle θ95°

Speed1.0×

Live Angles

θ₂ backrest—

θ₃ seat—

θ₄ footrest—

Footrest sweep—

Legend

CYAN — Base frame (fixed)

YELLOW — Backrest (crank A→B)

PURPLE — Seat pan (coupler B→C)

RED — Footrest (rocker C→D)

Upright ≈ 95° Reclined ≈ 140°
Scale × previews all links scaled up proportionally.
Green values = effective lengths at current scale.
Hit Bake to commit scaled values into the sliders.